Answer Posted / mufaddal hamdard

1.5m3 of dry material is required to get 1m3 of concrete.
and 2% or 5% is the amount of waste taken in account

1.5 + 0.02 is 1.52
or
1.5 + 0.05 is 1.55 thats it.

and now how 1.5 is derived is the question
As it is considered that when materials are mix in mixer the voids are finished after mixing and the output is 67% of the input in mixer
so
1/.67 is 1.5

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